Grass silage intake, rumen and blood variables, ultrasonic and body measurements, feeding behavior, and activity in pregnant beef heifers differing in phenotypic residual feed intake.

@article{Lawrence2011GrassSI,
  title={Grass silage intake, rumen and blood variables, ultrasonic and body measurements, feeding behavior, and activity in pregnant beef heifers differing in phenotypic residual feed intake.},
  author={P. Lawrence and David Anthony Kenny and Bernadette Earley and Denny H Crews and Mark McGee},
  journal={Journal of animal science},
  year={2011},
  volume={89 10},
  pages={
          3248-61
        }
}
The objectives of this study were to quantify the phenotypic variation in residual feed intake (RFI) in pregnant beef heifers offered a grass silage diet and to characterize their productivity. Seventy-three pregnant (mean gestation d 198, SD = 27 d) Simmental and Simmental × Holstein-Friesian heifers (mean initial BW 548, SD = 47.5 kg) were offered grass silage ad libitum. Heifer DMI, BW, BCS, skeletal measurements, ultrasonic fat and muscle depth, visual muscularity score, rumen fermentation… 
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Feeding behavior, ruminal fermentation, and performance of pregnant beef cows differing in phenotypic residual feed intake offered grass silage.
TLDR
Compared to cows with high RFI, those with low RFI consumed less feed for similar levels of productivity, spent less time engaged in feeding-behavior-related activities, and differed in ruminal fermentation parameters.
Methane emissions, body composition, and rumen fermentation traits of beef heifers differing in residual feed intake.
TLDR
Investigation of residual feed intake and performance with methane emissions, rumen fermentation, and digestion in beef heifers suggests that improved RFI will reduce methane emissions without affecting productivity of growing beef cattle.
Visceral organ weights, digestion and carcass characteristics of beef bulls differing in residual feed intake offered a high concentrate diet.
TLDR
Of the visceral organs measured, the reticulo-rumen may be a biologically significant contributory factor to variation in RFI in beef bulls finished on a high concentrate diet.
Relationships between postweaning residual feed intake in heifers and forage use, body composition, feeding behavior, physical activity, and heart rate of pregnant beef females.
TLDR
Results indicate that heifers identified as having low postweaning RFI have greater efficiency of forage utilization as pregnant females, with minimal impacts on growth, body composition, calving date, and calf birth BW, compared to their high-RFI counterparts.
Intake of conserved and grazed grass and performance traits in beef suckler cows differing in phenotypic residual feed intake
Grazed grass herbage intake and performance of beef heifers with predetermined phenotypic residual feed intake classification.
TLDR
Despite a sizeable difference in intake of grass silage between low and high RFI heifers during the indoor winter period, there were no detectable differences between RFI groupings for any economically important performance traits measured when animals were offered ensiled or grazed grass herbage.
Relationships between body condition score change, prior mid-lactation phenotypic residual feed intake, and hyperketonemia onset in transition dairy cows.
TLDR
Avoiding over conditioning of dry cows and subsequent excessive fat mobilization during the transition period may decrease HYK incidence; however, RFI during a prior lactation does not appear to be associated with HYK onset.
Whole-tract dry matter and nitrogen digestibility of lactating dairy cows selected for phenotypic divergence in residual feed intake
TLDR
Divergence in RFI as calves was not associated with differences in whole-tract DM or N digestibility in lactating cows, therefore, emphasis on selection for phenotypic divergence in R FI may not contribute to improved utilisation of consumed nutrients in Australian Holstein-Friesian dairy cows.
Relationship between residual feed intake and digestibility for lactating Holstein cows fed high and low starch diets.
TLDR
It is concluded that a cow's digestive ability explains none of the variation in RFI for cows eating high starch diets but 9 to 31% of the variations in R FI when cows are fed low starch diets.
Associations between residual feed intake and apparent nutrient digestibility, in vitro methane producing activity, and volatile fatty acid concentrations in growing beef cattle.
TLDR
Differences in observed phenotypic RFI in growing beef animals may be a result of inter-animal variation in apparent nutrient digestibility and ruminal VFA concentrations.
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TLDR
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